Obviously e-ink is great and all that, but when it's dark, we're in trouble.

Has anyone already bought a mobile reading light that would fit with the Kindle and give an OK light at night?

I got the MightyBright XtraFlex2. Clips on the case of the Kindle, very easy to read with and my girlfriend stopped growling at me when I read at night. Yay! Fast shipping. Takes 3 AAA batteries or works with an AC adapter. I was lucky, my phone charger (which is by my bed) works with it, so I usually have it plugged in there.

It's the same one that Amazon was offering, but I bought it from mightybright.com because Amazon was sold out. It's the first booklight I have ever used and I'm very pleased with it. There are threads discussing it somewhere....

I very rarely have a need to read away from a light source with my Kindle. However, it does happen from time to time. While camping I always use an LED headlamp for reading. I found a very inexpensive (about $5) solution that is not bulky at all in the Energizer Trim Flex LED. I found this at Target today back with the flashlights. Here's a webpage with all the specifics of this light:

I also purchased a MightyBright light that clips onto my Kindle cover. I like the 3 bulbs for wider coverage. Nice white light which I have used in a totally dark room. Very adjustable. I purchased one without the AC cord from Boarders for about $15. It uses 3 AAA batteries.

I actually have several I use for things like working in the car, under the house or wherever I need my hands free to work on something. I know they have all manner of light spectrums to be had so one has to fit an individual needs. They too are dead cheap and last FOREVER.

I use an old head torch that is way superseded for what I do outside. It's 3AA's, 3 LED's and a great reading light - not too bright, runs for a long time (over a week continuously if you forget to turn it off). Those are cheap now, even the $2 ones should be ok.